Drill bushing



Feb. 15', 1927. 1,617,554

. e. E. SWARTZ DRILL B'dsaI-ne Filed Dec. 16, 1925" Patented Feb. 15, 1927. o UNHTEEE FA orries.-

GUY E. SXVARTZ, OF DETRQIT, MICHIGAN.

DRILL BUSHING.

Application filed December In the drilling of metals considerable trouble is oftenv experienced from the formation of long chips or cuttings which it is often necessary to remove manually and which often results in the hands of the operator being cut, although this danger is sometimesavoided-by the use ofa hook. In any case the necessity for such removal of the chips presents an inconvenience and in many amount of times and. distracts the toemploy a bushing for the guidance of the V cases slows up the work, as they have a tendency to wind upward on the drill and their frequent removal occupies a certain operators attentionfrom the work. i

' here drill jigs are employed it is usual of the chips therebeneath so that the bush- 7 ing floats out of, position and its usefulness as a guide is lost for the time being.

Still further, time is frequently lost by the necessity of clearing the drill of long chipswhich are curled thereon before the bushing can be placed in position for the drilling of.

a succeeding hole. i

V This invention therefore has for its object to provide a form of bushing which by its use will eliminate the disadvantages hereinbefore referred to, and which may be permanently placed in a jig fixture due to the fact that there is no necessity of removing or lifting it from the fixture ,for the'purposes related.

A, further object is to provide a bush- 7 ing for use in drilling operations wherein special means are provided for the breaking of the cuttings, resulting from a drilling opera-tion, into short lengths whereby they will fall downward instead of winding upward ly on the drill; and still furtherobjects subsidiary to or resulting from the aforesaid objects, or from the construction or operation of the invention as it may be carried into effect, will become apparent as the said invention is hereinafter further disclosed. a

In carrying the said invention into effect, I may provide a bushing of brass or other suitable material adapted to act asra guide -1e, 1a25l Serial No. 75,683.

for a drill, the said bushing being provided with a downwardly openingconical or flared nmuth and withlupwardly extend-ing grooves .in the wall-of the bore thereof, the said grooves being "widened at their lower ends to receive the extremities of chips'or cuttings travelling upwardly-on the drill whereby the V spiral. progress of thesa'id cuttings is interrupted and; they tend to travel upwardly through the said grooves, f with the result that, as the drill revolves, the said cuttings are broken'into small pieces and fall from the mouth of the said bushingon to the work or work table. i

4 All ofnwhich' is morej particularly described and ascertained hereinafter by way of example, having reference to theaccompanying drawing, wherein- Figure l is an elevation partlyin section a drill jig, illustrating the lower end of a drill andv work in positiomthe said drill being guided by a bushing "embodying the said invention;

Figure 2' is a section taken 2 -25, Figure 1; and

Figure 3 is a detail sectional elevation of the bushing removed. 1 Similar characters of reference indicate similar parts in thielfseveral figuresof the drawing.

1 indicates a drill jig fixturesupporting a Y piece of work 2, and 3 a drill operating upon the saidswork, the said fixture being bored at 4 for the reception, ofa bushing 5,the saidbushing acting as a guide for the said drill, in the manner well known.

tn the line Ordinarilyplain bushings are employed V in this capacity, and the chips formed by and extending upwardly around the drill re suit in. the disadvantages"hereinbefore referred to. I i

It will be seen that the present bushing is provided at its lower end with aconical or flared mouth 6 for the interruption and reception of chips or cuttings which curl upwardly around the drill, and that the inner wall of the said bushing is provided with upwardly extending grooves 7 the lower ends of which are widened as at 8 to provide approaches therefor. Thus when the ends of cuttings travelling upwardly around the drill strike the conical mouth of the said bushing they will in the course of their motion eventually enter the widened lower ends of the said grooves 7,

and as their motion is a rotary one, this .7 motionwill be interrupted by the tendency o1 I I of thecut'tings to travel upwardly through the grooves and the interruption of their rotary motion by the "sides of the grooves and consequently the cutti'ngs will be broken up into short lengths. These short. lengths being no longer supported will then fall "nieath the bushing downwardly around the drill and are easily disposed ofwithout danger or loss of time,

land the upper part of the drill ,is there- ;forejkept free'of such cuttings. V a

Incidently; no clogging'of thechips be- 4 will take place, as is V a-po'ssible'j'wi h" he "ordinary plain bushing,

'andxas no necessity'for the lifting or re mOval 0f the" bushing torelieve such chips 7 ion cuttings exists, the bushing may be firmlyffixed in justments "will always the saidjig fixture so that noadthereof will be required, ZIIlCl'lt be maintained in correct rela iti'Oh" to the work. V

, It is preferred that the lower end or "mouth of the bushing shall be arranged in spaced relation to the work in order to give sufiicient clearai'ice for the free discharge of .the chips therefrom;

Although very simple in construction and i o'peratiomthedescribed device successfully overcomesall of the disadvantages previous- The grooves 7 are 'ly pointed out which are met with in the use ofbushings, v H of work in ji'g fixtures is greatly facilitated; shown as" extending completely through the bushings 5 because this'is 'a satisfactory forrn for machining by ordinary imethods but itfis not essential i that 1 the .groo'ves'fso extend completely through the bushing as it is the lower ends or mouths of the grooves which form the vabutnient s resulting in the breaking of the chips ,in the manner flu ntl t m rsre e,-,

described; Conseas usedherem, 1s

said invention, and

and by its use the drilling intended torefer to any formor slot,'notch or recess inthe mouth of the bushing which will serve as a means of interrupting the drill chips at the mouth ofthe bushing and 1. A self cleaning guide for metal work;

ing drills comprising bushing boredfor the passage of a drill 'therethrough said bushing havinga flared mouth at its lower end, and upwardly extending grooves in the inner wall thereof from said' flared mouth,

said grooves being adapted to interrupt cuttings extending upwardly around the drill whereby such 'cuttingsare broken into 7 small pieces. I i y 3 a V a 2. A device accord ng to claim 1,where1n the grooves are widened at their ends adj acent the mouth of said bushing.

. In combination with a device for the guidance of ametalworking drill relative towork, a self cleaning-drilllguideffixed in said device, said guide compmsmg a fixed bushing havlng a flared mouth in spaced relation to the work and provided with grooves extending upwardly'in the inner wall ofsaid bushing' f-rom said flared mouth for the interruption of cuttings entering the' mouth of said bushing, whereby such cuttings are broken up between the mouth of thebushing and the wor j f In testimony whereof I afiix my signature.

. GUY swAR'rz. 

